I think the correct answer would be 43 seconds. Reaction time is the time that it takes for one to react to a certain stimulus. For a car running at 30 mph, it is said that your reaction is about 43 seconds before you could stop the car.
according to study, it takes 1.5 seconds for a driver to react to something you see and bring your car to a complete stop.
according to public safety organization it will take 6 ft to stop a car if you are traveling at a speed of 30 mph
